Questions tagged [accretion-disk]
An accretion disk is the disk around a compact star that accumulates matter from e.g. a companion star by the Roche lobe overflow or stellar wind transfer.
86
questions
2
votes
1
answer
111
views
Black hole corona and bipolar outflows
What are black hole coronas? Are they different from accretion disks? If so, how are they formed?
- 472
0
votes
3
answers
931
views
Black hole accretion disk
Does matter in a black hole's accretion disk eventually fall into the black hole? If no new matter is added to disk, how long does it take or the black hole to consume the entire accretion disk?
- 39
1
vote
0
answers
69
views
Dependence of the magneto-rotational instability (MRI) on thermal relaxation?
The MRI is the most efficient driver of turbulence in accretion discs (as measured by the effective scalar stress). The magnetic field, being properly coupled to the gas (weak coupling), connects the ...
- 43
4
votes
5
answers
2k
views
Why does a black hole grow when it consumes matter? Isn't this a contradiction?
I've been thinking about this for a while but can't get my head around it.
A black hole's mass is such that its gravity can overcome light. Its event horizon, as I see it, is the boundary up to which ...
- 173
2
votes
1
answer
441
views
How do black hole jets form? [duplicate]
A black hole, neutron star or any object that has accumulated an accretion disc, sometimes features opposing jets, positioned perpendicular to the accretion disc.
I understand that these jets are ...
user81619
0
votes
0
answers
76
views
Star vs Blackhole - Accretion Disk
Simple question: can we prove that what we call today a "star" is not a accretion disk of a "tiny" black hole that happens to rotate in all the 3 axis?
- 315
2
votes
0
answers
131
views
Accretion disks on neutron star binaries
Why does hydrogen gas from accretion disks not constantly get sucked onto/into a neutron star or into a black hole? I understand that some gets sucked into the black hole and some may come down and ...
- 268
2
votes
1
answer
935
views
Angular momentum in planetary disk formation
This question is actually more linked to astronomy and astrophysics than to pure physics. I tried posting it on the astronomy page, however it got no answers, so I though this page might help.
...
- 133
2
votes
0
answers
121
views
Would a supermassive black hole accretion disk really vaporize solid objects?
Both the movie Interstellar and Greg Egan's Incandescence involve worlds deep inside accretion disks of large holes, kept at a comfortable temperature. Is this (remotely) realistic?
Although ...
- 6,531
4
votes
2
answers
1k
views
Angular momentum in an accretion disk
I need to plot the time evolution of the total angular momentum in an accretion disc. This confuses me because I thought this should be constant, since angular momentum has to be conserved?
I'm given ...
- 41
5
votes
2
answers
9k
views
How long does it take a black hole to eat a star?
I presume the answer is that it depends on the mass and size of the star and black hole and how they approach either other, but I was wondering if somebody could provide some rough bounds (e.g. hours ...
